The answer is to enable S3 Object Lock in Compliance mode, because this feature provides immutable storage that prevents any user, including the root account, from deleting or overwriting CloudTrail logs for a specified retention period. Compliance mode enforces a write-once-read-many (WORM) policy, ensuring log files remain intact and unaltered for the required 7-year compliance audit window, which versioning alone cannot guarantee. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of data protection mechanisms for audit trails, often appearing as a trap where versioning or Glacier might seem sufficient but fail to prevent deletion. A common mistake is choosing versioning, but remember that versioning only preserves previous versions—it does not block intentional deletion of the current object. For a quick memory tip: think “Compliance locks the logs” to recall that only S3 Object Lock in Compliance mode offers the strict, irreversible immutability needed for long-term compliance.
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses AWS CloudTrail to log API activity. The SysOps administrator needs to ensure that log files are protected from accidental deletion and are available for compliance audits for at least 7 years. Which service should be used to meet these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable S3 Object Lock in Compliance mode.
Option B is correct because S3 Object Lock with Compliance mode prevents deletion and ensures immutability. Option A is incorrect because versioning alone does not prevent deletion. Option C is incorrect because Glacier has retrieval delays and no write-once-read-many (WORM) protection. Option D is incorrect because CloudWatch Logs can store logs but does not provide WORM protection natively.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Enable S3 Object Lock in Compliance mode.
Why this is correct
Compliance mode prevents any user from deleting or overwriting objects for the retention period.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable S3 Versioning on the CloudTrail S3 bucket.
Why it's wrong here
Versioning preserves previous versions but does not prevent deletion of the current version.
✗
Move CloudTrail logs to Amazon S3 Glacier after 90 days.
Why it's wrong here
Glacier does not provide WORM protection by default.
✗
Store logs in Amazon CloudWatch Logs with an expiration policy of 7 years.
Why it's wrong here
CloudWatch Logs can retain logs but does not offer WORM protection.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable S3 Object Lock in Compliance mode. — Option B is correct because S3 Object Lock with Compliance mode prevents deletion and ensures immutability. Option A is incorrect because versioning alone does not prevent deletion. Option C is incorrect because Glacier has retrieval delays and no write-once-read-many (WORM) protection. Option D is incorrect because CloudWatch Logs can store logs but does not provide WORM protection natively.
What should I do if I get this SOA-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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